No

you don't need a jacket based on the weather in Prague, Czechia 1 second ago

60°F15°C & Mostly Cloudy

Wind is 2 mph4 km/h from the Southwest, gusting to 7 mph11 km/h
June 1
9pm59°F15°C3 mph5 km/h WestCloudy
10pm58°F15°C4 mph7 km/h WestCloudy
11pm58°F15°C4 mph6 km/h SouthwestCloudy
June 2
12am59°F15°C4 mph6 km/h SouthwestRain
1am60°F16°C3 mph5 km/h SouthwestRain
2am62°F16°C3 mph5 km/h SouthwestDrizzle
3am63°F17°C3 mph6 km/h WestCloudy
4am65°F18°C5 mph7 km/h WestCloudy
5am67°F19°C6 mph9 km/h WestCloudy
6am69°F20°C6 mph10 km/h WestCloudy
7am70°F21°C7 mph11 km/h WestCloudy
8am71°F21°C6 mph10 km/h WestCloudy
DateLowHighWindDayNight
June 158°F15°C72°F22°C5 mph8 km/h from WestRainDrizzle
June 256°F14°C73°F23°C4 mph6 km/h from SouthwestDrizzlePartly Cloudy
June 357°F14°C80°F27°C6 mph10 km/h from SouthPartly CloudyRain
June 458°F14°C71°F22°C10 mph16 km/h from SouthwestDrizzlePartly Cloudy
June 555°F13°C78°F26°C10 mph17 km/h from SouthwestPartly CloudyRain
June 657°F14°C72°F22°C8 mph14 km/h from SouthwestDrizzleDrizzle
June 751°F11°C67°F19°C10 mph17 km/h from WestThunderstormsMostly Clear

Yes

Low of 56°F14°C, High of 73°F23°C
Wind: 4 mph6 km/h
Precipitation: 30% rain

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